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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '286c9a5482f48cf6cff42e5fa55a8118693b3c97cd194303bd0949de40219e12' 
  AND token = 'MPeGQ4avLV0549IclmG1X8nYMMXIyTATySy6iEyN71s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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