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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f8e0e5dcd48cb837f8c3a4bf8f0e3e6d0b7697a2ba41011177a25620da4d8b4' 
  AND token = '5l6f42k/88soaWKG3njj0nLqJj2+fuk/YjyL1XHVXI8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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