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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9748ff23139bdb618561b1b9b9d583aae882ee54bf017d0c8a5256d6ffc0ff2e' 
  AND token = 'nCa0BHYZim+IB6i5TcAX2s27+ETuO/14cUKmTa/jweY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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