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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad7e0902866cdaa3a526e2da55bb4085a3c4b4b210580ae7368f276e585b1a84' 
  AND token = '1hfo7VgV9ijDdRaYtKv4bKDTIRjrTqb9khhNZyYm0wI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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