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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a77f565a69a399d815733bcf4deee3f6f77dd3a5bbd4786ae973ce98af8ce29b' 
  AND token = '84SwB2nm/zujAggpn2+OtQgs1GcpSgO/KBsgnsf4ACQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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