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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb2f05c50fead0974c591cfe360f71ac1f3c360be666045a051b9428491ffb4e' 
  AND token = 'i/hn5ojTdhXis/OiO6UN5xVSbL9F2LuQb346tUi+nes=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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