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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e0f64fed36651409b1fde7ef6d1a794ff6b23f75937c86c3e29150d16c6919c' 
  AND token = 'VHZLKJ95kVLLFGZqXdKI/UAvS2xLBOew7427w4eROGA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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