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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '181c13d73d39a3bf25a6eaa6e8fc7cd4f9790b59be6186d3bbc175753b917ae9' 
  AND token = 'HlhSWkakGSrocTWkzxJfJQGxfapNzN/NltlmtQ7IO1w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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