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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f519f2359a3809f0e9350c79d09e6c0949b0e93ce6d2de6b656f1633f9deb94' 
  AND token = 'yoilUp6GZhY6E0cVgRN3m8Lz4Y3dw5RjtGZsWnHq2Kw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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