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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98c908d24428de04bfa0d04911cecef6ff59e598e95fb7f6e5256a36a13445ad' 
  AND token = 'MUUVPgcDxX3LqT6dD2yxDeA6IyGch8B/ii69lkBYneY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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