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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e795f6622d4136baac154df82453b14c9b7dcbecd742025876d9f849d69320d8' 
  AND token = 'C90ISBoeBzBq88y4FxYLXgB7+rcwi9oC/Yr75+5lVQE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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