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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d1ed348ced570d7cd765583479bb6c83117512b4ecc94140e7fbba0e0a6965f' 
  AND token = 'WoU3Jzi8MZRlT2UhdzxLlpuOImIbZL/NZPNt+G6EIs8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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