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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '585c6385a8ebedb7493a4b1788ec5e07f924ddec18b648e67099da9697bc9a55' 
  AND token = 'n/wHDNM/NPgwC/laMKQFFSyhSXzu29qheAz+W/zkrHU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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