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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e1cd5e426647fe61e6643abc883cdc22da6e1e296974a6cf46d8069e8917bc1' 
  AND token = '02Mtyd0/1FKQ8vlB5qngAOxD2hI2bNkQccsncnNI1+g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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