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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20cfb581ca1ee8dc8bf82005d3db7222c9eaf44f450139a67dfe03f2df3fa7d3' 
  AND token = '50Xjwl/HRov+rDCil8uUNPUUDhWD55XOKCpZj2toz0I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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