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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1dd35f91316d128ce7696fb98b52080740e38d15ee9c542836ba1ce99d75c91' 
  AND token = 'IGs6wyrchxZG7q6q5krt2uOo0C9EmGXtPYJ7eGaCGHA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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