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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '936f69f1f238741262b5663f81ff7cd99f8eee6c90f81503fad6c4046b7c609b' 
  AND token = '/pjpPFf5WqCNFo/fRGFK/kefIutt2WKitkyu9O3ZUZs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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