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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1bffcf6e3f3a3cf72257fb7bcac2b837cff1452a316cfa970d33c2eb58e6d5dc' 
  AND token = 'eE4vg7jdwnffXdTX28Nrne312Uxo0Gmp83KN68FCTE8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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