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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '722a7ef3192329777fc60dc583358a336c0159f0204962ad8f309c7d28ae4705' 
  AND token = 'Th9wPxQuK/nokrmJnAkVPqI7r+jAhWyWFMd34y6q65o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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