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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fee52e41d83214c0f8de7ad3ef525dbb5657c27116072a8d55a290bb5b34dc2f' 
  AND token = 'MI0ImDOBRqGsass4pcs4Cp6N55RXa77/98kXyBDVt7o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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