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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a0c7d077b05f62740e2f34dcb5a61efbbb6d40a711c33dc9d8cfb2cd024a7cd' 
  AND token = '3BpkCk/FBfmly72bbvXrVkDJ6xd0QCbe03+UVUwMMnA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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