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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b70093960c089497506fc92b82c07fe3fc4c735c073040073d510d1c0748493b' 
  AND token = 'DsSUGQJDFVdHpDOPgl5TP69psft7IYOI9SJBDQd6/QA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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