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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6d82932ca14e7447c0edafcb3a7afb0755ab51f45c8121bd31890fdc2955e8e' 
  AND token = 'Nq1tw2yvE5XmhV2aIqZ5E01hTFyaX+xqBc7bkAV9hQo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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