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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '103c1b009c257a38fe6c7e035a31af3a2f3ad58317590ffa194fd255acdaaccf' 
  AND token = 'LDMqtZHZRt7zxY4i/ZqpFcVdBr175x8flSQPgW5Bszw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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