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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e126b788cf3a987810a3e9b20aaf8410675af3ac977047e67c06358db0ff249a' 
  AND token = '40CRcJz1K66wDRP1Y60LSLvCegPbpX6bS326oMQXiyw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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