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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca1fb028d11e3ac1660afd955b1436cec0265610561d39b99ec61d99dbefbf56' 
  AND token = 'zCQFeeAGc4vEVwMip/5fb6c1ek0of7JKSHSNUEFJ0jE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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