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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3db0260585890d2b665df9292ce0b029cdd30d5ecffd0ed0772bc9c7bb3b6a8b' 
  AND token = 'eNaA4y9uisgarrdMmqcdIc8y0hSVgyFW9qKtVJAqXCY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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