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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4a42bf4c8c568c94edd42db3939c475ece39f497e08f1af8820ef811f2f3a3a' 
  AND token = 'hAyeDOTt988H+q911VvkQOcfRZ7lOYutLGMOxG3DHtU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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