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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '939938b6eba5df3690fe6ad70fa63f65fe36144f318b80fbadb9ac1b5fd05715' 
  AND token = 'ALNx6KCA0fsLnzapoit7sJz3wjU/CzXNoDC3n3Fv81Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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