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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7538c03d9f1ac51e62504a1328fafc593c7c7f2048d2cc75860a214484fe324f' 
  AND token = 'at13ybGKRV+nv2ZIy9LrWc9K4bw5A9WGRakQMt7LJPA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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