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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42fc94abd6404b779dbe883c4ba9a5bdc840cb8cbdd478204021aecc79d0763a' 
  AND token = '/ukAreg1j7zMOZmbYJCTL/qqTUuB7RnW+selRGp8L08=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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