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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '092309528fa847dc9f57a7bf6c8f0bf58e1fa2d80092acbf1d2d30a19c1153fd' 
  AND token = '5YEbKEPAwWl1dmjf+vkv2IOKX6W/8iYeu/jn/dXUofo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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