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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbf00a4ce8b74fdab2393b4f92033e8a266fee6dd0577fd4f9fc763bdac71107' 
  AND token = '11UUpbpkJk2pL+u/NNU1yFHFVPNOjJndYHs1M/JB5sg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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