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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca995775073985fad21d4d671d5236995ed676c10a1d527f9eae142228165fda' 
  AND token = 'QILAtBAY48OwdOj0eTwc7yw0Ktei2yW5qXuA6E6nyYE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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