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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '089ca69800c17cb795b4fcd5f9a78eced736ed4d7ff7235f6a106c546e55ad5b' 
  AND token = 'iAIq+Hkq38bpB1dSLt+qwQtWRa2ZypJpZ06f3b9sWmE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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