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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd78a160724954176e289211bfb67740e3f5730c77bb6c4b2d6463b079307bd5' 
  AND token = 'ej6L2kZsRGTGaFF377hziHzcD4coZBqQI/lAwr7xlo0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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