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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb342836391694d297bc93921b4be77ddef9227703578cb2c53b585cbd7f3d71' 
  AND token = 'CPcTEDJYbNoTNwQNdVR8pChOAMrwD5yrIYD8W5eVTPA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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