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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04d3efd4f8ac78778fce2a2e3ff50b56e416027c5532cd5ebdf5ebb4760c7eef' 
  AND token = 'Y78P6gian1+vAtI81aPpbn9ue3ICq4aIEVFNaHLSw9w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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