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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4dd4f01c79a2d4e34aa6d5c7c92bf0fcf5be8a106e11b7f250d07308cbdaaad3' 
  AND token = 'MPXeodUiibE6BIc1m725Fzzk2xQkUsfC2sPqNcFosFs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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