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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7040753100ef4c60dd953672fca9efbf55e3ff26f5b402a238dd81dd1fd2ca4a' 
  AND token = 'FfCuL1Kby8iJiWRGLey0DKnk2Nr2CQuqed+BO24qzWI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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