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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '817c1754007d1c48f2826065e0f17a86beb2cc5f0e4e5f321a898ca693fb82c2' 
  AND token = 'YwcSUzn4Yb6mLcBSSJ+FbXihoMky97GoRHDh9WmOeNA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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