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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b03b8e9a175ac66b6b6978a740e57b992fd06dd9f83b7ae28531f35c94d87b74' 
  AND token = 'TZy80rIiHTe9kxPxlTHXbry3IrH49vltNPnVGFLKi48=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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