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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ec693858aba2dd8779b80e045ae6a8422f8425adb338ea6b0f77cf9b1ae12e6' 
  AND token = 'beh8ZLi0olHc1HrSPf2Y5/2GYbt3TVSqjYYWIJ+LrAQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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