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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6eb2a456d3c15249e2fd8b15b3dc5e70ff6f52fa3347eef266796f5a16f9e89f' 
  AND token = '23Mt6Uqw9tJAscW+KSAKdLLOQZuSusftRgCABKqkZug=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00256

JSON explain

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