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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b25731da40943fcba3a1e2be89d677e260bfd1cfba4e9ce13e02027e6eb7b8b' 
  AND token = '87lu/vtjgcCE7Utc2yp2RvqHLRcrFmw+WAvg/rBkcL4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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