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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d524a877eeedba211b311db00f56aa199b50cd4e9eed31fde8ff46173d219d2' 
  AND token = '4DDfnmp519AUG89AGJfE5twXbGuuDHQ4hnNaj7gGsYM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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