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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71f45bab66e366c5bb54635a15fee036c995235ee279793f710dbf6b6ef277e6' 
  AND token = 'D1UCKXdSMyBw2puSG0zE/D32N180VzpBA8mE7bcWMKo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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