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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '764c5e4b824a9a20abcf645105e14e37cf458147f1944a47ec93e538c97199e9' 
  AND token = 'Lu1sr0B7dH9WETqr9KLuiCxR+W4cdOQNGQNKSIXAQxk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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