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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4547b9040907ef52dc498fcaab4f7504873b90c7df049b606b5ca03379935365' 
  AND token = '3NdYLJOXx/hSYthirIcIho5kh4Hu2DtAWdVQhah6PDc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.01189

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}