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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40a9c8f79bfc69666885d6052d2f4f3a4f92c311f6926c05a5981d5e4820416d' 
  AND token = 'M63kC0Y24sPJh6Tvuw+ugRo+myay5RnaAOkuAxSyk14=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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