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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5d03782c5def7e839157dac85464de3a0083f0fc54ee7798fc4b3c966c92559' 
  AND token = 'bcU7c/BoDiNmwxL87Qeu8KRBb+rK1oZmM3/c7hxJlOM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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