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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c07dac6c1be8e999fd92183a4a2ddf0162c306d291bfc2fd3f77dfa80b30dff' 
  AND token = '4FQs57Pb3ZNjfjawl7HYMxrcOAp9DDq2FmVGbtN3ixc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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