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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56870559fff591967fe37f4383a8e722fd736b6413e4f4a62b222b8e8743764a' 
  AND token = 'JpXo+mS03vjZfeP3cVmp2nY56lIjm5W6SgcdAIJVH+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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