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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '384030767285f717e139eb449fad553f4a166baa25c5d141d7f0a7d4c4367643' 
  AND token = 'dYw1PIX1fqIJldDqJXHAOv7hXN5GDYF6uTEM+jfVNR4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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