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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a81a0ef3327f26abd902fd6daf1fafb86a45c60d689ebf13d085addc675159f' 
  AND token = 'HInpQy+YsGDZQkMyNxyqNcOoC/3C7CFEdEM+e2ZavsQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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