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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd00cd130ced26d9e5faf4a025a0dc47ba73080ea187800d00aefdefe49a3c607' 
  AND token = 'uVPgaEy2woZg6VB9XMVk4jBhNlpeFcK7J42W+6Iqq7U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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