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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2404fac9127d2e380665de26a9e81b59bf9100e134badfe5abd48483a5861e29' 
  AND token = 'CyWkMYA9AdXtMPMUzgRcO7BKPJGM0f6z/o9iQEo4f+w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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