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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '940c1791c2c763424057e3abef25212d91b5c33534ef40ae18d980cdbb87575d' 
  AND token = 'A3G1Pa/jzsMjNefKDWfXb4j4aDh9qh3OToGEP3ihmFw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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