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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9b7fa738bb9f31c19730d69ab84074252baf1d6ce1e4073c1e5610f3feb409b' 
  AND token = 'hfslOPU20XGi/oYgmk2XLoKhOxU13OGmDRYwsHy4CBE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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