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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02b7b15e578ed97f8b4d8fdde827f43143ded9d39714f5fcc8ecea2ef56a9261' 
  AND token = 'iPS18yFV2KYIm4ser6Btunq0uJw+dj6Hh5VM62ql4SU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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