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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55b3b4c7d39f779bc42ca3f1fc6d3b02ccb33202191088bfde720d4d6e85850f' 
  AND token = 'xLy2pinAMdm58trG42OYwYRWWTQqoMxz5/73AKeFfDY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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