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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1cadcf90138113e892b180a6335cc019174d44d25dcc13b72523507868f5b60' 
  AND token = 'YUpoIelsg3sa/s0IKOwHRzH0CmI/Xu/2tUbUG8OL00A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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