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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ddb86a0b51344207411452e7fd712183f0a5c5c782af6adaf10a788365eaebe' 
  AND token = 'cQwLk1DZVQfkRr1ds/o0wZi8Tc2+dbECwGJvwz6QJVQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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