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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1fff2c28e3367ae10e7e5fd6fd23d7c06a97d74146d297370350d866db1b78ac' 
  AND token = 'JBWVHiIlWY+k9kV0WQvVmRXYdpjVOKgeplg8ideGAC8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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