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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c1bab91321c4b19daa0176c913ee91f878fbc3cc930de8b6b38446a1ade31ed' 
  AND token = 'BnuThc7XD5DKVJ7ef2gBBp+qEYb6ap8KeKhdb44oD8w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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