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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b2aa74f3dad803508548ba85f62fb34c0ff6f219fd1d2116069d3ce0b7ebeb3' 
  AND token = 'j2NyOlY/oOllBwsofm2HoVOGnkek1k050DxUAGo/Ryg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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