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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2c9ab3a88bb8bf990125502c7ecc0786418afa5f46e1b5ebe5f7c04084f8da9' 
  AND token = 'AASuSbkNRfoicNG+H8126HIqkgl3xnZh4Zzg8jvN62g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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