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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05f3b4002ba37c3f49c8496539bd487009a5d6a4c131d707ff003ba919671996' 
  AND token = '5Z+gUeCbbL+Pk6cQhRZKXDJ/KMXNtdwhrKyMfFos0TQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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