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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b058c81775384cff7d560df1e075667039484487c1c9cb14ba7c4f8a5109c160' 
  AND token = 'VDEN92x39L7/zD8vj7dd517Ehi+mP+vg55Z3V9gXxi8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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