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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19f4bc297fcf7d0ecdbdbb8d6205b6a17d5aa6f23d7a3aacf0de5d4339d08f1b' 
  AND token = 'izVwcu2OPXQiH/Yw/OxnMdI1t+QkvdGhEOIDLg7lo9g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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