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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e3db5400d8796f951ea6db57d3f3082162eedf5f277f5e45f735a0c661666fc' 
  AND token = 'EW+UVf9C6w1DyRq5PSOOKpXJEib9iZast7P2Q3oVXOo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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