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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0f0a4d66aa51a0b56d584d5fbb6a75096ff39b35a205220a2007d3e2d8fc357' 
  AND token = '8n4k8WvJJ0rc3xFYuUfkPWehIvlERxfV3Q35f9CY3t0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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